Decorative light bulb



FIG. 1 is a front elevational view showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view of a second embodiment thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view of a third embodiment thereof; and,

FIG. 6 is a top plan view thereof. 

We claim the ornamental design for decorative light bulb, as shown and described. 